Hello! Log in or Register   |  Help  |  Donate  |  Buy Shirts See all banner ads | Advertise on TheSamba.com  
TheSamba.com
 
1500cc Okrasa
Page: 1, 2, 3  Next
Forum Index -> Vintage Speed Share: Facebook Twitter
Reply to topic
Print View
Quick sort: Show newest posts on top | Show oldest posts on top View previous topic :: View next topic  
Author Message
Vintage oval
Samba Member


Joined: September 13, 2004
Posts: 25
Location: Colorado
Vintage oval is offline 

PostPosted: Fri Nov 25, 2011 4:49 pm    Post subject: 1500cc Okrasa Reply with quote

I'm finishing up a 1500cc Okrasa 36hp motor with custom handmade linkage and would like some help jetting the Solex P40-11 carbs. The motor is 74mm x 80mm. Cam is 265 Dur, .322 Lift and the compression Ratio 8.5:1. The ventures are 32mm.

I'm in the Denver area and I'm thinking of using 122.5 mains, 180 air correction, 965 pilot. Has anyone used the P40-11 on Okrasa heads before that might be able to give me some suggestions on the jetting?



Image may have been reduced in size. Click image to view fullscreen.


Image may have been reduced in size. Click image to view fullscreen.
Back to top
View user's profile Send private message Gallery Classifieds Feedback
alanhall
Samba Member


Joined: February 18, 2006
Posts: 115
Location: Northern California
alanhall is offline 

PostPosted: Fri Nov 25, 2011 6:22 pm    Post subject: Reply with quote

Don't have experience with the Okrasa heads, but the jetting you are suggesting is standard for a split shaft 40PII-4 on a late 912 Porsche, 1600cc 9.3:1 CR. Might be a little rich for 1500 cc in Denver, perhaps a 115 or 120 main might work better. Are your carbs solid or split shaft? Engine looks great by the way!!
Back to top
View user's profile Send private message Send e-mail Gallery Classifieds Feedback
Vintage oval
Samba Member


Joined: September 13, 2004
Posts: 25
Location: Colorado
Vintage oval is offline 

PostPosted: Fri Nov 25, 2011 7:33 pm    Post subject: Reply with quote

Thanks for the info. The carbs are solid shaft. I have both split and solid shafts but decided to use the solid shaft as they look more period correct for the motor. I was trying to build something that looks it could of been built in the mid to late 50s
Back to top
View user's profile Send private message Gallery Classifieds Feedback
splitpile
Samba's Worst Speller


Joined: May 03, 2000
Posts: 5927
Location: back to living where hell meets the suface
splitpile is offline 

PostPosted: Fri Nov 25, 2011 9:57 pm    Post subject: Re: 1500cc Okrasa Reply with quote

Vintage oval wrote:
I'm finishing up a 1500cc Okrasa 36hp motor with custom handmade linkage and would like some help jetting the Solex P40-11 carbs. The motor is 74mm x 80mm. Cam is 265 Dur, .322 Lift and the compression Ratio 8.5:1. The ventures are 32mm.

I'm in the Denver area and I'm thinking of using 122.5 mains, 180 air correction, 965 pilot. Has anyone used the P40-11 on Okrasa heads before that might be able to give me some suggestions on the jetting?



Image may have been reduced in size. Click image to view fullscreen.


Image may have been reduced in size. Click image to view fullscreen.


Beautiful
_________________
Stocking distributor of "The Funky Green Panels"
www.BUSTORATION.com metal and more for your bus
"no more hacking my sig line"
Back to top
View user's profile Send private message Send e-mail Visit poster's website AIM Address Gallery Classifieds Feedback
gimmesomeshelter
Samba Member


Joined: May 08, 2004
Posts: 1468
Location: San Carlos, CA
gimmesomeshelter is offline 

PostPosted: Fri Nov 25, 2011 10:22 pm    Post subject: Reply with quote

Hello-

I'm so jealous!

I bought some Zenith carbs recently, but now I'm having second thoughts. Wink

Cheers,

Paul
Back to top
View user's profile Send private message Gallery Classifieds Feedback
grueni
Samba Member


Joined: November 03, 2008
Posts: 582
Location: Germany
grueni is offline 

PostPosted: Fri Nov 25, 2011 10:27 pm    Post subject: Reply with quote

very beautiful. in first thoughts i would say the vents could be too big for this engine in low and mid range.
_________________
1960 1584cc turbocharged, 35,5/32 (11,117s 1/4mile )
Back to top
View user's profile Send private message Gallery Classifieds Feedback
Vintage oval
Samba Member


Joined: September 13, 2004
Posts: 25
Location: Colorado
Vintage oval is offline 

PostPosted: Fri Nov 25, 2011 10:53 pm    Post subject: Reply with quote

I also have a set of 28mm ventures that I can try out on the carbs if the 32mm take away too much from the low end and mid range.
Back to top
View user's profile Send private message Gallery Classifieds Feedback
Roadcow
Samba Member


Joined: November 14, 2003
Posts: 1012
Location: Stockton, Ca. area
Roadcow is offline 

PostPosted: Sat Nov 26, 2011 12:23 am    Post subject: Reply with quote

Talk with Richard Troy, I used his Okrasa 1500cc with those same carbs at Bonneville 2 years ago. Ran 92 mph in my Ghia. Beautiful engine.
_________________
71 Westy Roadcow
67 Panel
63 Bug
66 Ghia Bonneville 2014
74 Ghia Vert
69 Bonneville Ghia 150 in Chico
69 Bonneville Ghia in Ireland
80 Cabby 2.1 16v
98 Passat
Back to top
View user's profile Send private message Classifieds Feedback
alanhall
Samba Member


Joined: February 18, 2006
Posts: 115
Location: Northern California
alanhall is offline 

PostPosted: Sat Nov 26, 2011 12:39 am    Post subject: Reply with quote

Just for comparisons the jetting used for solid shaft 40PII-4 on the 356 1600 Super 90 motor was: 115 main, 32 venturies, 57.5 idle, 1.8 idle air, 50 pump, and #25 emmulsion tube. The jetting used for the solid shaft, sand cast 40PII-4 on a 1500GS 4-cam motor was 102.5 main, 30 venturis, 50 idle, 1.5 idle air, 50 pump and #33 emmulsion tube. The sand cast 40PII-4 were similar but a somewhat different design compared to the later die cast 40PII-4 carbs.
Back to top
View user's profile Send private message Send e-mail Gallery Classifieds Feedback
oldbusboy
Samba Member


Joined: June 25, 2006
Posts: 604
Location: Bowen Island, BC Canada
oldbusboy is offline 

PostPosted: Sat Nov 26, 2011 2:41 pm    Post subject: Reply with quote

That motor looks awesome!

Sorry, nothing to add to the jetting question, but I'd love to see a video of that running.

Trevor
_________________
1968 porsche
Back to top
View user's profile Send private message Send e-mail Gallery Classifieds Feedback
Louis
Samba Member


Joined: September 26, 2007
Posts: 423
Location: canada BC
Louis is offline 

PostPosted: Sun Nov 27, 2011 2:08 am    Post subject: Reply with quote

where did you get the manifold?


cheers!
Back to top
View user's profile Send private message Send e-mail AIM Address MSN Messenger Gallery Classifieds Feedback
Vintage oval
Samba Member


Joined: September 13, 2004
Posts: 25
Location: Colorado
Vintage oval is offline 

PostPosted: Sun Nov 27, 2011 6:14 am    Post subject: Reply with quote

I got the manifolds from Speedwell USA.
Back to top
View user's profile Send private message Gallery Classifieds Feedback
Jacks
Samba Member


Joined: July 15, 2006
Posts: 2344
Location: San Clemente, Ca.
Jacks is offline 

PostPosted: Sun Nov 27, 2011 11:27 am    Post subject: Re: 1500cc Okrasa Reply with quote

Vintage oval wrote:

I'm in the Denver area and I'm thinking of using 122.5 mains, 180 air correction, 965 pilot.


What is a 965 pilot?
Back to top
View user's profile Send private message Send e-mail Classifieds Feedback
Louis
Samba Member


Joined: September 26, 2007
Posts: 423
Location: canada BC
Louis is offline 

PostPosted: Mon Nov 28, 2011 12:33 pm    Post subject: Reply with quote

any phone number for speedwell?
i emailed him from his website but no answer.

love those manifold... want them!
Back to top
View user's profile Send private message Send e-mail AIM Address MSN Messenger Gallery Classifieds Feedback
Louis
Samba Member


Joined: September 26, 2007
Posts: 423
Location: canada BC
Louis is offline 

PostPosted: Mon Nov 28, 2011 12:35 pm    Post subject: Reply with quote

are those carbs too big or they work great for this motor?

anyone want a set of pbic32?

cheers!
Back to top
View user's profile Send private message Send e-mail AIM Address MSN Messenger Gallery Classifieds Feedback
gimmesomeshelter
Samba Member


Joined: May 08, 2004
Posts: 1468
Location: San Carlos, CA
gimmesomeshelter is offline 

PostPosted: Tue Nov 29, 2011 1:53 pm    Post subject: Reply with quote

Hello-

Regarding your choice of ventruis, how do you want your car to drive?

Do you prefer to step on the gas at 2K and have something happen? If so, try the 28mm venturis first. If you prefer to let all the other cars pass you by until you finally reach 4K, then go with the 32mm. Given the modest duration of your cam, I suspect that the 32mm venturis may be a bit of a mismatch. Keep in mind that Pre-A Supers came with 26mm venturis for for normal driving, and used 29mm for racing.

Cheers,

Paul
Back to top
View user's profile Send private message Gallery Classifieds Feedback
rcraigbug
Samba Member


Joined: July 12, 2004
Posts: 240

rcraigbug is offline 

PostPosted: Tue Nov 29, 2011 5:44 pm    Post subject: Reply with quote

Louis wrote:
any phone number for speedwell?
i emailed him from his website but no answer.

love those manifold... want them!


http://www.thesamba.com/vw/classifieds/detail.php?id=1226387
_________________
http://www.oldtimeroldspeedclub.blogspot.com/
Member United States Chapter
Back to top
View user's profile Send private message Send e-mail Facebook Gallery Classifieds Feedback
gimmesomeshelter
Samba Member


Joined: May 08, 2004
Posts: 1468
Location: San Carlos, CA
gimmesomeshelter is offline 

PostPosted: Mon Jan 23, 2012 10:37 pm    Post subject: Reply with quote

Hello-

Have you made any progress with your carbs?

Cheers,

Paul
_________________
"I would rather have questions that can't be answered than answers that can't be questioned."

Richard Feynman
Back to top
View user's profile Send private message Gallery Classifieds Feedback
earthquake
Samba Member


Joined: January 10, 2008
Posts: 3984
Location: SANDY VALLEY, NEVADA
earthquake is offline 

PostPosted: Tue Jan 24, 2012 12:32 am    Post subject: Reply with quote

That motor is beautiful but it should be hung on a nicer stand...
Image may have been reduced in size. Click image to view fullscreen.


Just kidding Very Happy

Casey
_________________
74 CLASS 11 LOOK-A-LIKE
69 DUNE BUGGY
79 INTERNATIONAL SCOUT II
05 SCION XB SERIES RELEASE 2[#437]
95 Chevy C3500 dually
98 Ford E150
Link to Kelly J. Nolte 3/20/53 - 11/6/08
https://time-zonelabs.blogspot.com/p/about-kelly.html
DEATH TO CHINGERS!
[From a military recruitment poster in the novel "The Stainless Steel Rat" By Harry Harrison]
Back to top
View user's profile Send private message Gallery Classifieds Feedback
Vintage oval
Samba Member


Joined: September 13, 2004
Posts: 25
Location: Colorado
Vintage oval is offline 

PostPosted: Wed Jan 25, 2012 10:27 pm    Post subject: Venturs Reply with quote

Here is an update on the ventures. I am looking a drivable engine, not a race engine so I am thinking of going with 26mm ventures. These will give me around 4500 rpm limit and will give torque in the lower range which I think will make it more drivable in the city. Anyone have any experience with selecting ventures for a 1500cc engine with two dual carbs?
Back to top
View user's profile Send private message Gallery Classifieds Feedback
Display posts from previous:   
Reply to topic    Forum Index -> Vintage Speed All times are Mountain Standard Time/Pacific Daylight Savings Time
Page: 1, 2, 3  Next
Page 1 of 3

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum

About | Help! | Advertise | Donate | Premium Membership | Privacy/Terms of Use | Contact Us | Site Map
Copyright © 1996-2023, Everett Barnes. All Rights Reserved.
Not affiliated with or sponsored by Volkswagen of America | Forum powered by phpBB
Links to eBay or other vendor sites may be affiliate links where the site receives compensation.